net/mac80211/mlme.c

   1 /*
   2  * BSS client mode implementation
   3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
   4  * Copyright 2004, Instant802 Networks, Inc.
   5  * Copyright 2005, Devicescape Software, Inc.
   6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <linux/pm_qos_params.h>
  21 #include <linux/crc32.h>
  22 #include <net/mac80211.h>
  23 #include <asm/unaligned.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "rate.h"
  28 #include "led.h"
  29
  30 #define IEEE80211_MAX_PROBE_TRIES 5
  31
  32 /*
  33  * beacon loss detection timeout
  34  * XXX: should depend on beacon interval
  35  */
  36 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
  37 /*
  38  * Time the connection can be idle before we probe
  39  * it to see if we can still talk to the AP.
  40  */
  41 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
  42 /*
  43  * Time we wait for a probe response after sending
  44  * a probe request because of beacon loss or for
  45  * checking the connection still works.
  46  */
  47 #define IEEE80211_PROBE_WAIT            (HZ / 2)
  48
  49 #define TMR_RUNNING_TIMER       0
  50 #define TMR_RUNNING_CHANSW      1
  51
  52 /*
  53  * All cfg80211 functions have to be called outside a locked
  54  * section so that they can acquire a lock themselves... This
  55  * is much simpler than queuing up things in cfg80211, but we
  56  * do need some indirection for that here.
  57  */
  58 enum rx_mgmt_action {
  59         /* no action required */
  60         RX_MGMT_NONE,
  61
  62         /* caller must call cfg80211_send_rx_auth() */
  63         RX_MGMT_CFG80211_AUTH,
  64
  65         /* caller must call cfg80211_send_rx_assoc() */
  66         RX_MGMT_CFG80211_ASSOC,
  67
  68         /* caller must call cfg80211_send_deauth() */
  69         RX_MGMT_CFG80211_DEAUTH,
  70
  71         /* caller must call cfg80211_send_disassoc() */
  72         RX_MGMT_CFG80211_DISASSOC,
  73
  74         /* caller must tell cfg80211 about internal error */
  75         RX_MGMT_CFG80211_ASSOC_ERROR,
  76 };
  77
  78 /* utils */
  79 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
  80 {
  81         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
  82 }
  83
  84 /*
  85  * We can have multiple work items (and connection probing)
  86  * scheduling this timer, but we need to take care to only
  87  * reschedule it when it should fire _earlier_ than it was
  88  * asked for before, or if it's not pending right now. This
  89  * function ensures that. Note that it then is required to
  90  * run this function for all timeouts after the first one
  91  * has happened -- the work that runs from this timer will
  92  * do that.
  93  */
  94 static void run_again(struct ieee80211_if_managed *ifmgd,
  95                              unsigned long timeout)
  96 {
  97         ASSERT_MGD_MTX(ifmgd);
  98
  99         if (!timer_pending(&ifmgd->timer) ||
 100             time_before(timeout, ifmgd->timer.expires))
 101                 mod_timer(&ifmgd->timer, timeout);
 102 }
 103
 104 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
 105 {
 106         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
 107                 return;
 108
 109         mod_timer(&sdata->u.mgd.bcn_mon_timer,
 110                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
 111 }
 112
 113 static int ecw2cw(int ecw)
 114 {
 115         return (1 << ecw) - 1;
 116 }
 117
 118 /*
 119  * ieee80211_enable_ht should be called only after the operating band
 120  * has been determined as ht configuration depends on the hw's
 121  * HT abilities for a specific band.
 122  */
 123 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 124                                struct ieee80211_ht_info *hti,
 125                                const u8 *bssid, u16 ap_ht_cap_flags)
 126 {
 127         struct ieee80211_local *local = sdata->local;
 128         struct ieee80211_supported_band *sband;
 129         struct sta_info *sta;
 130         u32 changed = 0;
 131         u16 ht_opmode;
 132         bool enable_ht = true, ht_changed;
 133         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 134
 135         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 136
 137         /* HT is not supported */
 138         if (!sband->ht_cap.ht_supported)
 139                 enable_ht = false;
 140
 141         /* check that channel matches the right operating channel */
 142         if (local->hw.conf.channel->center_freq !=
 143             ieee80211_channel_to_frequency(hti->control_chan))
 144                 enable_ht = false;
 145
 146         if (enable_ht) {
 147                 channel_type = NL80211_CHAN_HT20;
 148
 149                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 150                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 151                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 152                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 153                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 154                                 if (!(local->hw.conf.channel->flags &
 155                                     IEEE80211_CHAN_NO_HT40PLUS))
 156                                         channel_type = NL80211_CHAN_HT40PLUS;
 157                                 break;
 158                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 159                                 if (!(local->hw.conf.channel->flags &
 160                                     IEEE80211_CHAN_NO_HT40MINUS))
 161                                         channel_type = NL80211_CHAN_HT40MINUS;
 162                                 break;
 163                         }
 164                 }
 165         }
 166
 167         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 168                      channel_type != local->hw.conf.channel_type;
 169
 170         if (local->tmp_channel)
 171                 local->tmp_channel_type = channel_type;
 172         local->oper_channel_type = channel_type;
 173
 174         if (ht_changed) {
 175                 /* channel_type change automatically detected */
 176                 ieee80211_hw_config(local, 0);
 177
 178                 rcu_read_lock();
 179                 sta = sta_info_get(sdata, bssid);
 180                 if (sta)
 181                         rate_control_rate_update(local, sband, sta,
 182                                                  IEEE80211_RC_HT_CHANGED,
 183                                                  local->oper_channel_type);
 184                 rcu_read_unlock();
 185         }
 186
 187         /* disable HT */
 188         if (!enable_ht)
 189                 return 0;
 190
 191         ht_opmode = le16_to_cpu(hti->operation_mode);
 192
 193         /* if bss configuration changed store the new one */
 194         if (!sdata->ht_opmode_valid ||
 195             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
 196                 changed |= BSS_CHANGED_HT;
 197                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
 198                 sdata->ht_opmode_valid = true;
 199         }
 200
 201         return changed;
 202 }
 203
 204 /* frame sending functions */
 205
 206 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 207                                            const u8 *bssid, u16 stype, u16 reason,
 208                                            void *cookie)
 209 {
 210         struct ieee80211_local *local = sdata->local;
 211         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 212         struct sk_buff *skb;
 213         struct ieee80211_mgmt *mgmt;
 214
 215         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
 216         if (!skb) {
 217                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
 218                        "deauth/disassoc frame\n", sdata->name);
 219                 return;
 220         }
 221         skb_reserve(skb, local->hw.extra_tx_headroom);
 222
 223         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 224         memset(mgmt, 0, 24);
 225         memcpy(mgmt->da, bssid, ETH_ALEN);
 226         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 227         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 228         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 229         skb_put(skb, 2);
 230         /* u.deauth.reason_code == u.disassoc.reason_code */
 231         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 232
 233         if (stype == IEEE80211_STYPE_DEAUTH)
 234                 if (cookie)
 235                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 236                 else
 237                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
 238         else
 239                 if (cookie)
 240                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 241                 else
 242                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
 243         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
 244                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 245         ieee80211_tx_skb(sdata, skb);
 246 }
 247
 248 void ieee80211_send_pspoll(struct ieee80211_local *local,
 249                            struct ieee80211_sub_if_data *sdata)
 250 {
 251         struct ieee80211_pspoll *pspoll;
 252         struct sk_buff *skb;
 253
 254         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
 255         if (!skb)
 256                 return;
 257
 258         pspoll = (struct ieee80211_pspoll *) skb->data;
 259         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 260
 261         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 262         ieee80211_tx_skb(sdata, skb);
 263 }
 264
 265 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 266                              struct ieee80211_sub_if_data *sdata,
 267                              int powersave)
 268 {
 269         struct sk_buff *skb;
 270         struct ieee80211_hdr_3addr *nullfunc;
 271
 272         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
 273         if (!skb)
 274                 return;
 275
 276         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
 277         if (powersave)
 278                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 279
 280         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 281         ieee80211_tx_skb(sdata, skb);
 282 }
 283
 284 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
 285                                           struct ieee80211_sub_if_data *sdata)
 286 {
 287         struct sk_buff *skb;
 288         struct ieee80211_hdr *nullfunc;
 289         __le16 fc;
 290
 291         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
 292                 return;
 293
 294         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
 295         if (!skb) {
 296                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
 297                        "nullfunc frame\n", sdata->name);
 298                 return;
 299         }
 300         skb_reserve(skb, local->hw.extra_tx_headroom);
 301
 302         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
 303         memset(nullfunc, 0, 30);
 304         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 305                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 306         nullfunc->frame_control = fc;
 307         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
 308         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 309         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
 310         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
 311
 312         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 313         ieee80211_tx_skb(sdata, skb);
 314 }
 315
 316 /* spectrum management related things */
 317 static void ieee80211_chswitch_work(struct work_struct *work)
 318 {
 319         struct ieee80211_sub_if_data *sdata =
 320                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
 321         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 322
 323         if (!ieee80211_sdata_running(sdata))
 324                 return;
 325
 326         mutex_lock(&ifmgd->mtx);
 327         if (!ifmgd->associated)
 328                 goto out;
 329
 330         sdata->local->oper_channel = sdata->local->csa_channel;
 331         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
 332
 333         /* XXX: shouldn't really modify cfg80211-owned data! */
 334         ifmgd->associated->channel = sdata->local->oper_channel;
 335
 336         ieee80211_wake_queues_by_reason(&sdata->local->hw,
 337                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 338  out:
 339         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
 340         mutex_unlock(&ifmgd->mtx);
 341 }
 342
 343 static void ieee80211_chswitch_timer(unsigned long data)
 344 {
 345         struct ieee80211_sub_if_data *sdata =
 346                 (struct ieee80211_sub_if_data *) data;
 347         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 348
 349         if (sdata->local->quiescing) {
 350                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
 351                 return;
 352         }
 353
 354         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 355 }
 356
 357 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 358                                       struct ieee80211_channel_sw_ie *sw_elem,
 359                                       struct ieee80211_bss *bss)
 360 {
 361         struct cfg80211_bss *cbss =
 362                 container_of((void *)bss, struct cfg80211_bss, priv);
 363         struct ieee80211_channel *new_ch;
 364         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 365         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
 366
 367         ASSERT_MGD_MTX(ifmgd);
 368
 369         if (!ifmgd->associated)
 370                 return;
 371
 372         if (sdata->local->scanning)
 373                 return;
 374
 375         /* Disregard subsequent beacons if we are already running a timer
 376            processing a CSA */
 377
 378         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
 379                 return;
 380
 381         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
 382         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
 383                 return;
 384
 385         sdata->local->csa_channel = new_ch;
 386
 387         if (sw_elem->count <= 1) {
 388                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
 389         } else {
 390                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
 391                                         IEEE80211_QUEUE_STOP_REASON_CSA);
 392                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
 393                 mod_timer(&ifmgd->chswitch_timer,
 394                           jiffies +
 395                           msecs_to_jiffies(sw_elem->count *
 396                                            cbss->beacon_interval));
 397         }
 398 }
 399
 400 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
 401                                         u16 capab_info, u8 *pwr_constr_elem,
 402                                         u8 pwr_constr_elem_len)
 403 {
 404         struct ieee80211_conf *conf = &sdata->local->hw.conf;
 405
 406         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
 407                 return;
 408
 409         /* Power constraint IE length should be 1 octet */
 410         if (pwr_constr_elem_len != 1)
 411                 return;
 412
 413         if ((*pwr_constr_elem <= conf->channel->max_power) &&
 414             (*pwr_constr_elem != sdata->local->power_constr_level)) {
 415                 sdata->local->power_constr_level = *pwr_constr_elem;
 416                 ieee80211_hw_config(sdata->local, 0);
 417         }
 418 }
 419
 420 /* powersave */
 421 static void ieee80211_enable_ps(struct ieee80211_local *local,
 422                                 struct ieee80211_sub_if_data *sdata)
 423 {
 424         struct ieee80211_conf *conf = &local->hw.conf;
 425
 426         /*
 427          * If we are scanning right now then the parameters will
 428          * take effect when scan finishes.
 429          */
 430         if (local->scanning)
 431                 return;
 432
 433         if (conf->dynamic_ps_timeout > 0 &&
 434             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
 435                 mod_timer(&local->dynamic_ps_timer, jiffies +
 436                           msecs_to_jiffies(conf->dynamic_ps_timeout));
 437         } else {
 438                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 439                         ieee80211_send_nullfunc(local, sdata, 1);
 440
 441                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 442                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
 443                         return;
 444
 445                 conf->flags |= IEEE80211_CONF_PS;
 446                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 447         }
 448 }
 449
 450 static void ieee80211_change_ps(struct ieee80211_local *local)
 451 {
 452         struct ieee80211_conf *conf = &local->hw.conf;
 453
 454         if (local->ps_sdata) {
 455                 ieee80211_enable_ps(local, local->ps_sdata);
 456         } else if (conf->flags & IEEE80211_CONF_PS) {
 457                 conf->flags &= ~IEEE80211_CONF_PS;
 458                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 459                 del_timer_sync(&local->dynamic_ps_timer);
 460                 cancel_work_sync(&local->dynamic_ps_enable_work);
 461         }
 462 }
 463
 464 /* need to hold RTNL or interface lock */
 465 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
 466 {
 467         struct ieee80211_sub_if_data *sdata, *found = NULL;
 468         int count = 0;
 469
 470         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
 471                 local->ps_sdata = NULL;
 472                 return;
 473         }
 474
 475         if (!list_empty(&local->work_list)) {
 476                 local->ps_sdata = NULL;
 477                 goto change;
 478         }
 479
 480         list_for_each_entry(sdata, &local->interfaces, list) {
 481                 if (!ieee80211_sdata_running(sdata))
 482                         continue;
 483                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
 484                         continue;
 485                 found = sdata;
 486                 count++;
 487         }
 488
 489         if (count == 1 && found->u.mgd.powersave &&
 490             found->u.mgd.associated &&
 491             found->u.mgd.associated->beacon_ies &&
 492             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
 493                                     IEEE80211_STA_CONNECTION_POLL))) {
 494                 s32 beaconint_us;
 495
 496                 if (latency < 0)
 497                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
 498
 499                 beaconint_us = ieee80211_tu_to_usec(
 500                                         found->vif.bss_conf.beacon_int);
 501
 502                 if (beaconint_us > latency) {
 503                         local->ps_sdata = NULL;
 504                 } else {
 505                         struct ieee80211_bss *bss;
 506                         int maxslp = 1;
 507                         u8 dtimper;
 508
 509                         bss = (void *)found->u.mgd.associated->priv;
 510                         dtimper = bss->dtim_period;
 511
 512                         /* If the TIM IE is invalid, pretend the value is 1 */
 513                         if (!dtimper)
 514                                 dtimper = 1;
 515                         else if (dtimper > 1)
 516                                 maxslp = min_t(int, dtimper,
 517                                                     latency / beaconint_us);
 518
 519                         local->hw.conf.max_sleep_period = maxslp;
 520                         local->hw.conf.ps_dtim_period = dtimper;
 521                         local->ps_sdata = found;
 522                 }
 523         } else {
 524                 local->ps_sdata = NULL;
 525         }
 526
 527  change:
 528         ieee80211_change_ps(local);
 529 }
 530
 531 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 532 {
 533         struct ieee80211_local *local =
 534                 container_of(work, struct ieee80211_local,
 535                              dynamic_ps_disable_work);
 536
 537         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 538                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 539                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 540         }
 541
 542         ieee80211_wake_queues_by_reason(&local->hw,
 543                                         IEEE80211_QUEUE_STOP_REASON_PS);
 544 }
 545
 546 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
 547 {
 548         struct ieee80211_local *local =
 549                 container_of(work, struct ieee80211_local,
 550                              dynamic_ps_enable_work);
 551         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
 552         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 553
 554         /* can only happen when PS was just disabled anyway */
 555         if (!sdata)
 556                 return;
 557
 558         if (local->hw.conf.flags & IEEE80211_CONF_PS)
 559                 return;
 560
 561         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
 562             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
 563                 ieee80211_send_nullfunc(local, sdata, 1);
 564
 565         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 566               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
 567             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
 568                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 569                 local->hw.conf.flags |= IEEE80211_CONF_PS;
 570                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 571         }
 572 }
 573
 574 void ieee80211_dynamic_ps_timer(unsigned long data)
 575 {
 576         struct ieee80211_local *local = (void *) data;
 577
 578         if (local->quiescing || local->suspended)
 579                 return;
 580
 581         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
 582 }
 583
 584 /* MLME */
 585 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
 586                                      struct ieee80211_if_managed *ifmgd,
 587                                      u8 *wmm_param, size_t wmm_param_len)
 588 {
 589         struct ieee80211_tx_queue_params params;
 590         size_t left;
 591         int count;
 592         u8 *pos, uapsd_queues = 0;
 593
 594         if (local->hw.queues < 4)
 595                 return;
 596
 597         if (!wmm_param)
 598                 return;
 599
 600         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
 601                 return;
 602
 603         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
 604                 uapsd_queues = local->uapsd_queues;
 605
 606         count = wmm_param[6] & 0x0f;
 607         if (count == ifmgd->wmm_last_param_set)
 608                 return;
 609         ifmgd->wmm_last_param_set = count;
 610
 611         pos = wmm_param + 8;
 612         left = wmm_param_len - 8;
 613
 614         memset(&params, 0, sizeof(params));
 615
 616         local->wmm_acm = 0;
 617         for (; left >= 4; left -= 4, pos += 4) {
 618                 int aci = (pos[0] >> 5) & 0x03;
 619                 int acm = (pos[0] >> 4) & 0x01;
 620                 bool uapsd = false;
 621                 int queue;
 622
 623                 switch (aci) {
 624                 case 1: /* AC_BK */
 625                         queue = 3;
 626                         if (acm)
 627                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
 628                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
 629                                 uapsd = true;
 630                         break;
 631                 case 2: /* AC_VI */
 632                         queue = 1;
 633                         if (acm)
 634                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
 635                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
 636                                 uapsd = true;
 637                         break;
 638                 case 3: /* AC_VO */
 639                         queue = 0;
 640                         if (acm)
 641                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
 642                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
 643                                 uapsd = true;
 644                         break;
 645                 case 0: /* AC_BE */
 646                 default:
 647                         queue = 2;
 648                         if (acm)
 649                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
 650                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
 651                                 uapsd = true;
 652                         break;
 653                 }
 654
 655                 params.aifs = pos[0] & 0x0f;
 656                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
 657                 params.cw_min = ecw2cw(pos[1] & 0x0f);
 658                 params.txop = get_unaligned_le16(pos + 2);
 659                 params.uapsd = uapsd;
 660
 661 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 662                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
 663                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
 664                        wiphy_name(local->hw.wiphy), queue, aci, acm,
 665                        params.aifs, params.cw_min, params.cw_max, params.txop,
 666                        params.uapsd);
 667 #endif
 668                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
 669                         printk(KERN_DEBUG "%s: failed to set TX queue "
 670                                "parameters for queue %d\n",
 671                                wiphy_name(local->hw.wiphy), queue);
 672         }
 673 }
 674
 675 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
 676                                            u16 capab, bool erp_valid, u8 erp)
 677 {
 678         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
 679         u32 changed = 0;
 680         bool use_protection;
 681         bool use_short_preamble;
 682         bool use_short_slot;
 683
 684         if (erp_valid) {
 685                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
 686                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
 687         } else {
 688                 use_protection = false;
 689                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
 690         }
 691
 692         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 693         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
 694                 use_short_slot = true;
 695
 696         if (use_protection != bss_conf->use_cts_prot) {
 697                 bss_conf->use_cts_prot = use_protection;
 698                 changed |= BSS_CHANGED_ERP_CTS_PROT;
 699         }
 700
 701         if (use_short_preamble != bss_conf->use_short_preamble) {
 702                 bss_conf->use_short_preamble = use_short_preamble;
 703                 changed |= BSS_CHANGED_ERP_PREAMBLE;
 704         }
 705
 706         if (use_short_slot != bss_conf->use_short_slot) {
 707                 bss_conf->use_short_slot = use_short_slot;
 708                 changed |= BSS_CHANGED_ERP_SLOT;
 709         }
 710
 711         return changed;
 712 }
 713
 714 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 715                                      struct cfg80211_bss *cbss,
 716                                      u32 bss_info_changed)
 717 {
 718         struct ieee80211_bss *bss = (void *)cbss->priv;
 719         struct ieee80211_local *local = sdata->local;
 720
 721         bss_info_changed |= BSS_CHANGED_ASSOC;
 722         /* set timing information */
 723         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
 724         sdata->vif.bss_conf.timestamp = cbss->tsf;
 725
 726         bss_info_changed |= BSS_CHANGED_BEACON_INT;
 727         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 728                 cbss->capability, bss->has_erp_value, bss->erp_value);
 729
 730         sdata->u.mgd.associated = cbss;
 731         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
 732
 733         /* just to be sure */
 734         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
 735                                 IEEE80211_STA_BEACON_POLL);
 736
 737         /*
 738          * Always handle WMM once after association regardless
 739          * of the first value the AP uses. Setting -1 here has
 740          * that effect because the AP values is an unsigned
 741          * 4-bit value.
 742          */
 743         sdata->u.mgd.wmm_last_param_set = -1;
 744
 745         ieee80211_led_assoc(local, 1);
 746
 747         sdata->vif.bss_conf.assoc = 1;
 748         /*
 749          * For now just always ask the driver to update the basic rateset
 750          * when we have associated, we aren't checking whether it actually
 751          * changed or not.
 752          */
 753         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
 754
 755         /* And the BSSID changed - we're associated now */
 756         bss_info_changed |= BSS_CHANGED_BSSID;
 757
 758         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 759
 760         mutex_lock(&local->iflist_mtx);
 761         ieee80211_recalc_ps(local, -1);
 762         ieee80211_recalc_smps(local, sdata);
 763         mutex_unlock(&local->iflist_mtx);
 764
 765         netif_tx_start_all_queues(sdata->dev);
 766         netif_carrier_on(sdata->dev);
 767 }
 768
 769 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
 770 {
 771         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 772         struct ieee80211_local *local = sdata->local;
 773         struct sta_info *sta;
 774         u32 changed = 0, config_changed = 0;
 775         u8 bssid[ETH_ALEN];
 776
 777         ASSERT_MGD_MTX(ifmgd);
 778
 779         if (WARN_ON(!ifmgd->associated))
 780                 return;
 781
 782         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
 783
 784         ifmgd->associated = NULL;
 785         memset(ifmgd->bssid, 0, ETH_ALEN);
 786
 787         /*
 788          * we need to commit the associated = NULL change because the
 789          * scan code uses that to determine whether this iface should
 790          * go to/wake up from powersave or not -- and could otherwise
 791          * wake the queues erroneously.
 792          */
 793         smp_mb();
 794
 795         /*
 796          * Thus, we can only afterwards stop the queues -- to account
 797          * for the case where another CPU is finishing a scan at this
 798          * time -- we don't want the scan code to enable queues.
 799          */
 800
 801         netif_tx_stop_all_queues(sdata->dev);
 802         netif_carrier_off(sdata->dev);
 803
 804         rcu_read_lock();
 805         sta = sta_info_get(sdata, bssid);
 806         if (sta) {
 807                 set_sta_flags(sta, WLAN_STA_DISASSOC);
 808                 ieee80211_sta_tear_down_BA_sessions(sta);
 809         }
 810         rcu_read_unlock();
 811
 812         changed |= ieee80211_reset_erp_info(sdata);
 813
 814         ieee80211_led_assoc(local, 0);
 815         changed |= BSS_CHANGED_ASSOC;
 816         sdata->vif.bss_conf.assoc = false;
 817
 818         ieee80211_set_wmm_default(sdata);
 819
 820         /* channel(_type) changes are handled by ieee80211_hw_config */
 821         local->oper_channel_type = NL80211_CHAN_NO_HT;
 822
 823         /* on the next assoc, re-program HT parameters */
 824         sdata->ht_opmode_valid = false;
 825
 826         local->power_constr_level = 0;
 827
 828         del_timer_sync(&local->dynamic_ps_timer);
 829         cancel_work_sync(&local->dynamic_ps_enable_work);
 830
 831         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 832                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 833                 config_changed |= IEEE80211_CONF_CHANGE_PS;
 834         }
 835
 836         ieee80211_hw_config(local, config_changed);
 837
 838         /* And the BSSID changed -- not very interesting here */
 839         changed |= BSS_CHANGED_BSSID;
 840         ieee80211_bss_info_change_notify(sdata, changed);
 841
 842         sta_info_destroy_addr(sdata, bssid);
 843 }
 844
 845 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
 846                              struct ieee80211_hdr *hdr)
 847 {
 848         /*
 849          * We can postpone the mgd.timer whenever receiving unicast frames
 850          * from AP because we know that the connection is working both ways
 851          * at that time. But multicast frames (and hence also beacons) must
 852          * be ignored here, because we need to trigger the timer during
 853          * data idle periods for sending the periodic probe request to the
 854          * AP we're connected to.
 855          */
 856         if (is_multicast_ether_addr(hdr->addr1))
 857                 return;
 858
 859         mod_timer(&sdata->u.mgd.conn_mon_timer,
 860                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
 861 }
 862
 863 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
 864 {
 865         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 866         const u8 *ssid;
 867
 868         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
 869         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
 870                                  ssid + 2, ssid[1], NULL, 0);
 871
 872         ifmgd->probe_send_count++;
 873         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
 874         run_again(ifmgd, ifmgd->probe_timeout);
 875 }
 876
 877 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
 878                                    bool beacon)
 879 {
 880         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 881         bool already = false;
 882
 883         if (!ieee80211_sdata_running(sdata))
 884                 return;
 885
 886         if (sdata->local->scanning)
 887                 return;
 888
 889         if (sdata->local->tmp_channel)
 890                 return;
 891
 892         mutex_lock(&ifmgd->mtx);
 893
 894         if (!ifmgd->associated)
 895                 goto out;
 896
 897 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 898         if (beacon && net_ratelimit())
 899                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
 900                        "- sending probe request\n", sdata->name);
 901 #endif
 902
 903         /*
 904          * The driver/our work has already reported this event or the
 905          * connection monitoring has kicked in and we have already sent
 906          * a probe request. Or maybe the AP died and the driver keeps
 907          * reporting until we disassociate...
 908          *
 909          * In either case we have to ignore the current call to this
 910          * function (except for setting the correct probe reason bit)
 911          * because otherwise we would reset the timer every time and
 912          * never check whether we received a probe response!
 913          */
 914         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
 915                             IEEE80211_STA_CONNECTION_POLL))
 916                 already = true;
 917
 918         if (beacon)
 919                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
 920         else
 921                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
 922
 923         if (already)
 924                 goto out;
 925
 926         mutex_lock(&sdata->local->iflist_mtx);
 927         ieee80211_recalc_ps(sdata->local, -1);
 928         mutex_unlock(&sdata->local->iflist_mtx);
 929
 930         ifmgd->probe_send_count = 0;
 931         ieee80211_mgd_probe_ap_send(sdata);
 932  out:
 933         mutex_unlock(&ifmgd->mtx);
 934 }
 935
 936 void ieee80211_beacon_loss_work(struct work_struct *work)
 937 {
 938         struct ieee80211_sub_if_data *sdata =
 939                 container_of(work, struct ieee80211_sub_if_data,
 940                              u.mgd.beacon_loss_work);
 941
 942         ieee80211_mgd_probe_ap(sdata, true);
 943 }
 944
 945 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
 946 {
 947         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 948
 949         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
 950 }
 951 EXPORT_SYMBOL(ieee80211_beacon_loss);
 952
 953 static enum rx_mgmt_action __must_check
 954 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
 955                          struct ieee80211_mgmt *mgmt, size_t len)
 956 {
 957         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 958         const u8 *bssid = NULL;
 959         u16 reason_code;
 960
 961         if (len < 24 + 2)
 962                 return RX_MGMT_NONE;
 963
 964         ASSERT_MGD_MTX(ifmgd);
 965
 966         bssid = ifmgd->associated->bssid;
 967
 968         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
 969
 970         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
 971                         sdata->name, bssid, reason_code);
 972
 973         ieee80211_set_disassoc(sdata);
 974         ieee80211_recalc_idle(sdata->local);
 975
 976         return RX_MGMT_CFG80211_DEAUTH;
 977 }
 978
 979
 980 static enum rx_mgmt_action __must_check
 981 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
 982                            struct ieee80211_mgmt *mgmt, size_t len)
 983 {
 984         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 985         u16 reason_code;
 986
 987         if (len < 24 + 2)
 988                 return RX_MGMT_NONE;
 989
 990         ASSERT_MGD_MTX(ifmgd);
 991
 992         if (WARN_ON(!ifmgd->associated))
 993                 return RX_MGMT_NONE;
 994
 995         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
 996                 return RX_MGMT_NONE;
 997
 998         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
 999
1000         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1001                         sdata->name, mgmt->sa, reason_code);
1002
1003         ieee80211_set_disassoc(sdata);
1004         ieee80211_recalc_idle(sdata->local);
1005         return RX_MGMT_CFG80211_DISASSOC;
1006 }
1007
1008
1009 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1010                                     struct ieee80211_mgmt *mgmt, size_t len)
1011 {
1012         struct ieee80211_sub_if_data *sdata = wk->sdata;
1013         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1014         struct ieee80211_local *local = sdata->local;
1015         struct ieee80211_supported_band *sband;
1016         struct sta_info *sta;
1017         struct cfg80211_bss *cbss = wk->assoc.bss;
1018         u8 *pos;
1019         u32 rates, basic_rates;
1020         u16 capab_info, aid;
1021         struct ieee802_11_elems elems;
1022         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1023         u32 changed = 0;
1024         int i, j, err;
1025         bool have_higher_than_11mbit = false;
1026         u16 ap_ht_cap_flags;
1027
1028         /* AssocResp and ReassocResp have identical structure */
1029
1030         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1031         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1032
1033         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1034                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1035                        "set\n", sdata->name, aid);
1036         aid &= ~(BIT(15) | BIT(14));
1037
1038         pos = mgmt->u.assoc_resp.variable;
1039         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1040
1041         if (!elems.supp_rates) {
1042                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1043                        sdata->name);
1044                 return false;
1045         }
1046
1047         ifmgd->aid = aid;
1048
1049         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1050         if (!sta) {
1051                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1052                        " the AP\n", sdata->name);
1053                 return false;
1054         }
1055
1056         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1057                            WLAN_STA_ASSOC_AP);
1058         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1059                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1060
1061         rates = 0;
1062         basic_rates = 0;
1063         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1064
1065         for (i = 0; i < elems.supp_rates_len; i++) {
1066                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1067                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1068
1069                 if (rate > 110)
1070                         have_higher_than_11mbit = true;
1071
1072                 for (j = 0; j < sband->n_bitrates; j++) {
1073                         if (sband->bitrates[j].bitrate == rate) {
1074                                 rates |= BIT(j);
1075                                 if (is_basic)
1076                                         basic_rates |= BIT(j);
1077                                 break;
1078                         }
1079                 }
1080         }
1081
1082         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1083                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1084                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1085
1086                 if (rate > 110)
1087                         have_higher_than_11mbit = true;
1088
1089                 for (j = 0; j < sband->n_bitrates; j++) {
1090                         if (sband->bitrates[j].bitrate == rate) {
1091                                 rates |= BIT(j);
1092                                 if (is_basic)
1093                                         basic_rates |= BIT(j);
1094                                 break;
1095                         }
1096                 }
1097         }
1098
1099         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1100         sdata->vif.bss_conf.basic_rates = basic_rates;
1101
1102         /* cf. IEEE 802.11 9.2.12 */
1103         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1104             have_higher_than_11mbit)
1105                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1106         else
1107                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1108
1109         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1110                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1111                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1112
1113         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1114
1115         rate_control_rate_init(sta);
1116
1117         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1118                 set_sta_flags(sta, WLAN_STA_MFP);
1119
1120         if (elems.wmm_param)
1121                 set_sta_flags(sta, WLAN_STA_WME);
1122
1123         err = sta_info_insert(sta);
1124         sta = NULL;
1125         if (err) {
1126                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1127                        " the AP (error %d)\n", sdata->name, err);
1128                 return false;
1129         }
1130
1131         if (elems.wmm_param)
1132                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1133                                          elems.wmm_param_len);
1134         else
1135                 ieee80211_set_wmm_default(sdata);
1136
1137         local->oper_channel = wk->chan;
1138
1139         if (elems.ht_info_elem && elems.wmm_param &&
1140             (sdata->local->hw.queues >= 4) &&
1141             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1142                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1143                                                cbss->bssid, ap_ht_cap_flags);
1144
1145         /* set AID and assoc capability,
1146          * ieee80211_set_associated() will tell the driver */
1147         bss_conf->aid = aid;
1148         bss_conf->assoc_capability = capab_info;
1149         ieee80211_set_associated(sdata, cbss, changed);
1150
1151         /*
1152          * If we're using 4-addr mode, let the AP know that we're
1153          * doing so, so that it can create the STA VLAN on its side
1154          */
1155         if (ifmgd->use_4addr)
1156                 ieee80211_send_4addr_nullfunc(local, sdata);
1157
1158         /*
1159          * Start timer to probe the connection to the AP now.
1160          * Also start the timer that will detect beacon loss.
1161          */
1162         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1163         mod_beacon_timer(sdata);
1164
1165         return true;
1166 }
1167
1168
1169 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1170                                   struct ieee80211_mgmt *mgmt,
1171                                   size_t len,
1172                                   struct ieee80211_rx_status *rx_status,
1173                                   struct ieee802_11_elems *elems,
1174                                   bool beacon)
1175 {
1176         struct ieee80211_local *local = sdata->local;
1177         int freq;
1178         struct ieee80211_bss *bss;
1179         struct ieee80211_channel *channel;
1180         bool need_ps = false;
1181
1182         if (sdata->u.mgd.associated) {
1183                 bss = (void *)sdata->u.mgd.associated->priv;
1184                 /* not previously set so we may need to recalc */
1185                 need_ps = !bss->dtim_period;
1186         }
1187
1188         if (elems->ds_params && elems->ds_params_len == 1)
1189                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1190         else
1191                 freq = rx_status->freq;
1192
1193         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1194
1195         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1196                 return;
1197
1198         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1199                                         channel, beacon);
1200         if (bss)
1201                 ieee80211_rx_bss_put(local, bss);
1202
1203         if (!sdata->u.mgd.associated)
1204                 return;
1205
1206         if (need_ps) {
1207                 mutex_lock(&local->iflist_mtx);
1208                 ieee80211_recalc_ps(local, -1);
1209                 mutex_unlock(&local->iflist_mtx);
1210         }
1211
1212         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1213             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1214                                                         ETH_ALEN) == 0)) {
1215                 struct ieee80211_channel_sw_ie *sw_elem =
1216                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1217                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1218         }
1219 }
1220
1221
1222 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1223                                          struct sk_buff *skb)
1224 {
1225         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1226         struct ieee80211_if_managed *ifmgd;
1227         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1228         size_t baselen, len = skb->len;
1229         struct ieee802_11_elems elems;
1230
1231         ifmgd = &sdata->u.mgd;
1232
1233         ASSERT_MGD_MTX(ifmgd);
1234
1235         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1236                 return; /* ignore ProbeResp to foreign address */
1237
1238         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1239         if (baselen > len)
1240                 return;
1241
1242         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1243                                 &elems);
1244
1245         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1246
1247         if (ifmgd->associated &&
1248             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1249             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1250                             IEEE80211_STA_CONNECTION_POLL)) {
1251                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1252                                   IEEE80211_STA_BEACON_POLL);
1253                 mutex_lock(&sdata->local->iflist_mtx);
1254                 ieee80211_recalc_ps(sdata->local, -1);
1255                 mutex_unlock(&sdata->local->iflist_mtx);
1256                 /*
1257                  * We've received a probe response, but are not sure whether
1258                  * we have or will be receiving any beacons or data, so let's
1259                  * schedule the timers again, just in case.
1260                  */
1261                 mod_beacon_timer(sdata);
1262                 mod_timer(&ifmgd->conn_mon_timer,
1263                           round_jiffies_up(jiffies +
1264                                            IEEE80211_CONNECTION_IDLE_TIME));
1265         }
1266 }
1267
1268 /*
1269  * This is the canonical list of information elements we care about,
1270  * the filter code also gives us all changes to the Microsoft OUI
1271  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1272  *
1273  * We implement beacon filtering in software since that means we can
1274  * avoid processing the frame here and in cfg80211, and userspace
1275  * will not be able to tell whether the hardware supports it or not.
1276  *
1277  * XXX: This list needs to be dynamic -- userspace needs to be able to
1278  *      add items it requires. It also needs to be able to tell us to
1279  *      look out for other vendor IEs.
1280  */
1281 static const u64 care_about_ies =
1282         (1ULL << WLAN_EID_COUNTRY) |
1283         (1ULL << WLAN_EID_ERP_INFO) |
1284         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1285         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1286         (1ULL << WLAN_EID_HT_CAPABILITY) |
1287         (1ULL << WLAN_EID_HT_INFORMATION);
1288
1289 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1290                                      struct ieee80211_mgmt *mgmt,
1291                                      size_t len,
1292                                      struct ieee80211_rx_status *rx_status)
1293 {
1294         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1295         size_t baselen;
1296         struct ieee802_11_elems elems;
1297         struct ieee80211_local *local = sdata->local;
1298         u32 changed = 0;
1299         bool erp_valid, directed_tim = false;
1300         u8 erp_value = 0;
1301         u32 ncrc;
1302         u8 *bssid;
1303
1304         ASSERT_MGD_MTX(ifmgd);
1305
1306         /* Process beacon from the current BSS */
1307         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1308         if (baselen > len)
1309                 return;
1310
1311         if (rx_status->freq != local->hw.conf.channel->center_freq)
1312                 return;
1313
1314         /*
1315          * We might have received a number of frames, among them a
1316          * disassoc frame and a beacon...
1317          */
1318         if (!ifmgd->associated)
1319                 return;
1320
1321         bssid = ifmgd->associated->bssid;
1322
1323         /*
1324          * And in theory even frames from a different AP we were just
1325          * associated to a split-second ago!
1326          */
1327         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1328                 return;
1329
1330         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1331 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1332                 if (net_ratelimit()) {
1333                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1334                                "to a received beacon\n", sdata->name);
1335                 }
1336 #endif
1337                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1338                 mutex_lock(&local->iflist_mtx);
1339                 ieee80211_recalc_ps(local, -1);
1340                 mutex_unlock(&local->iflist_mtx);
1341         }
1342
1343         /*
1344          * Push the beacon loss detection into the future since
1345          * we are processing a beacon from the AP just now.
1346          */
1347         mod_beacon_timer(sdata);
1348
1349         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1350         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1351                                           len - baselen, &elems,
1352                                           care_about_ies, ncrc);
1353
1354         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1355                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1356                                                    ifmgd->aid);
1357
1358         if (ncrc != ifmgd->beacon_crc) {
1359                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1360                                       true);
1361
1362                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1363                                          elems.wmm_param_len);
1364         }
1365
1366         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1367                 if (directed_tim) {
1368                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1369                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1370                                 ieee80211_hw_config(local,
1371                                                     IEEE80211_CONF_CHANGE_PS);
1372                                 ieee80211_send_nullfunc(local, sdata, 0);
1373                         } else {
1374                                 local->pspolling = true;
1375
1376                                 /*
1377                                  * Here is assumed that the driver will be
1378                                  * able to send ps-poll frame and receive a
1379                                  * response even though power save mode is
1380                                  * enabled, but some drivers might require
1381                                  * to disable power save here. This needs
1382                                  * to be investigated.
1383                                  */
1384                                 ieee80211_send_pspoll(local, sdata);
1385                         }
1386                 }
1387         }
1388
1389         if (ncrc == ifmgd->beacon_crc)
1390                 return;
1391         ifmgd->beacon_crc = ncrc;
1392
1393         if (elems.erp_info && elems.erp_info_len >= 1) {
1394                 erp_valid = true;
1395                 erp_value = elems.erp_info[0];
1396         } else {
1397                 erp_valid = false;
1398         }
1399         changed |= ieee80211_handle_bss_capability(sdata,
1400                         le16_to_cpu(mgmt->u.beacon.capab_info),
1401                         erp_valid, erp_value);
1402
1403
1404         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1405             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1406                 struct sta_info *sta;
1407                 struct ieee80211_supported_band *sband;
1408                 u16 ap_ht_cap_flags;
1409
1410                 rcu_read_lock();
1411
1412                 sta = sta_info_get(sdata, bssid);
1413                 if (WARN_ON(!sta)) {
1414                         rcu_read_unlock();
1415                         return;
1416                 }
1417
1418                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1419
1420                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1421                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1422
1423                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1424
1425                 rcu_read_unlock();
1426
1427                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1428                                                bssid, ap_ht_cap_flags);
1429         }
1430
1431         /* Note: country IE parsing is done for us by cfg80211 */
1432         if (elems.country_elem) {
1433                 /* TODO: IBSS also needs this */
1434                 if (elems.pwr_constr_elem)
1435                         ieee80211_handle_pwr_constr(sdata,
1436                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1437                                 elems.pwr_constr_elem,
1438                                 elems.pwr_constr_elem_len);
1439         }
1440
1441         ieee80211_bss_info_change_notify(sdata, changed);
1442 }
1443
1444 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1445                                           struct sk_buff *skb)
1446 {
1447         struct ieee80211_local *local = sdata->local;
1448         struct ieee80211_mgmt *mgmt;
1449         u16 fc;
1450
1451         if (skb->len < 24)
1452                 return RX_DROP_MONITOR;
1453
1454         mgmt = (struct ieee80211_mgmt *) skb->data;
1455         fc = le16_to_cpu(mgmt->frame_control);
1456
1457         switch (fc & IEEE80211_FCTL_STYPE) {
1458         case IEEE80211_STYPE_PROBE_RESP:
1459         case IEEE80211_STYPE_BEACON:
1460         case IEEE80211_STYPE_DEAUTH:
1461         case IEEE80211_STYPE_DISASSOC:
1462         case IEEE80211_STYPE_ACTION:
1463                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1464                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1465                 return RX_QUEUED;
1466         }
1467
1468         return RX_DROP_MONITOR;
1469 }
1470
1471 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1472                                          struct sk_buff *skb)
1473 {
1474         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1475         struct ieee80211_rx_status *rx_status;
1476         struct ieee80211_mgmt *mgmt;
1477         enum rx_mgmt_action rma = RX_MGMT_NONE;
1478         u16 fc;
1479
1480         rx_status = (struct ieee80211_rx_status *) skb->cb;
1481         mgmt = (struct ieee80211_mgmt *) skb->data;
1482         fc = le16_to_cpu(mgmt->frame_control);
1483
1484         mutex_lock(&ifmgd->mtx);
1485
1486         if (ifmgd->associated &&
1487             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1488                 switch (fc & IEEE80211_FCTL_STYPE) {
1489                 case IEEE80211_STYPE_BEACON:
1490                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1491                                                  rx_status);
1492                         break;
1493                 case IEEE80211_STYPE_PROBE_RESP:
1494                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1495                         break;
1496                 case IEEE80211_STYPE_DEAUTH:
1497                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1498                         break;
1499                 case IEEE80211_STYPE_DISASSOC:
1500                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1501                         break;
1502                 case IEEE80211_STYPE_ACTION:
1503                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1504                                 break;
1505
1506                         ieee80211_sta_process_chanswitch(sdata,
1507                                         &mgmt->u.action.u.chan_switch.sw_elem,
1508                                         (void *)ifmgd->associated->priv);
1509                         break;
1510                 }
1511                 mutex_unlock(&ifmgd->mtx);
1512
1513                 switch (rma) {
1514                 case RX_MGMT_NONE:
1515                         /* no action */
1516                         break;
1517                 case RX_MGMT_CFG80211_DEAUTH:
1518                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1519                         break;
1520                 case RX_MGMT_CFG80211_DISASSOC:
1521                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1522                         break;
1523                 default:
1524                         WARN(1, "unexpected: %d", rma);
1525                 }
1526                 goto out;
1527         }
1528
1529         mutex_unlock(&ifmgd->mtx);
1530
1531         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1532             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1533                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1534
1535  out:
1536         kfree_skb(skb);
1537 }
1538
1539 static void ieee80211_sta_timer(unsigned long data)
1540 {
1541         struct ieee80211_sub_if_data *sdata =
1542                 (struct ieee80211_sub_if_data *) data;
1543         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1544         struct ieee80211_local *local = sdata->local;
1545
1546         if (local->quiescing) {
1547                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1548                 return;
1549         }
1550
1551         ieee80211_queue_work(&local->hw, &ifmgd->work);
1552 }
1553
1554 static void ieee80211_sta_work(struct work_struct *work)
1555 {
1556         struct ieee80211_sub_if_data *sdata =
1557                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1558         struct ieee80211_local *local = sdata->local;
1559         struct ieee80211_if_managed *ifmgd;
1560         struct sk_buff *skb;
1561
1562         if (!ieee80211_sdata_running(sdata))
1563                 return;
1564
1565         if (local->scanning)
1566                 return;
1567
1568         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1569                 return;
1570
1571         /*
1572          * ieee80211_queue_work() should have picked up most cases,
1573          * here we'll pick the the rest.
1574          */
1575         if (WARN(local->suspended, "STA MLME work scheduled while "
1576                  "going to suspend\n"))
1577                 return;
1578
1579         ifmgd = &sdata->u.mgd;
1580
1581         /* first process frames to avoid timing out while a frame is pending */
1582         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1583                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1584
1585         /* then process the rest of the work */
1586         mutex_lock(&ifmgd->mtx);
1587
1588         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1589                             IEEE80211_STA_CONNECTION_POLL) &&
1590             ifmgd->associated) {
1591                 u8 bssid[ETH_ALEN];
1592
1593                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1594                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1595                         run_again(ifmgd, ifmgd->probe_timeout);
1596
1597                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1598 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1599                         printk(KERN_DEBUG "No probe response from AP %pM"
1600                                 " after %dms, try %d\n", bssid,
1601                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1602                                 ifmgd->probe_send_count);
1603 #endif
1604                         ieee80211_mgd_probe_ap_send(sdata);
1605                 } else {
1606                         /*
1607                          * We actually lost the connection ... or did we?
1608                          * Let's make sure!
1609                          */
1610                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1611                                           IEEE80211_STA_BEACON_POLL);
1612                         printk(KERN_DEBUG "No probe response from AP %pM"
1613                                 " after %dms, disconnecting.\n",
1614                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1615                         ieee80211_set_disassoc(sdata);
1616                         ieee80211_recalc_idle(local);
1617                         mutex_unlock(&ifmgd->mtx);
1618                         /*
1619                          * must be outside lock due to cfg80211,
1620                          * but that's not a problem.
1621                          */
1622                         ieee80211_send_deauth_disassoc(sdata, bssid,
1623                                         IEEE80211_STYPE_DEAUTH,
1624                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1625                                         NULL);
1626                         mutex_lock(&ifmgd->mtx);
1627                 }
1628         }
1629
1630         mutex_unlock(&ifmgd->mtx);
1631 }
1632
1633 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1634 {
1635         struct ieee80211_sub_if_data *sdata =
1636                 (struct ieee80211_sub_if_data *) data;
1637         struct ieee80211_local *local = sdata->local;
1638
1639         if (local->quiescing)
1640                 return;
1641
1642         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1643 }
1644
1645 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1646 {
1647         struct ieee80211_sub_if_data *sdata =
1648                 (struct ieee80211_sub_if_data *) data;
1649         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1650         struct ieee80211_local *local = sdata->local;
1651
1652         if (local->quiescing)
1653                 return;
1654
1655         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1656 }
1657
1658 static void ieee80211_sta_monitor_work(struct work_struct *work)
1659 {
1660         struct ieee80211_sub_if_data *sdata =
1661                 container_of(work, struct ieee80211_sub_if_data,
1662                              u.mgd.monitor_work);
1663
1664         ieee80211_mgd_probe_ap(sdata, false);
1665 }
1666
1667 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1668 {
1669         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1670                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1671                                         IEEE80211_STA_CONNECTION_POLL);
1672
1673                 /* let's probe the connection once */
1674                 ieee80211_queue_work(&sdata->local->hw,
1675                            &sdata->u.mgd.monitor_work);
1676                 /* and do all the other regular work too */
1677                 ieee80211_queue_work(&sdata->local->hw,
1678                            &sdata->u.mgd.work);
1679         }
1680 }
1681
1682 #ifdef CONFIG_PM
1683 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1684 {
1685         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1686
1687         /*
1688          * we need to use atomic bitops for the running bits
1689          * only because both timers might fire at the same
1690          * time -- the code here is properly synchronised.
1691          */
1692
1693         cancel_work_sync(&ifmgd->work);
1694         cancel_work_sync(&ifmgd->beacon_loss_work);
1695         if (del_timer_sync(&ifmgd->timer))
1696                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1697
1698         cancel_work_sync(&ifmgd->chswitch_work);
1699         if (del_timer_sync(&ifmgd->chswitch_timer))
1700                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1701
1702         cancel_work_sync(&ifmgd->monitor_work);
1703         /* these will just be re-established on connection */
1704         del_timer_sync(&ifmgd->conn_mon_timer);
1705         del_timer_sync(&ifmgd->bcn_mon_timer);
1706 }
1707
1708 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1709 {
1710         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1711
1712         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1713                 add_timer(&ifmgd->timer);
1714         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1715                 add_timer(&ifmgd->chswitch_timer);
1716 }
1717 #endif
1718
1719 /* interface setup */
1720 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1721 {
1722         struct ieee80211_if_managed *ifmgd;
1723
1724         ifmgd = &sdata->u.mgd;
1725         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1726         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1727         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1728         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1729         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1730                     (unsigned long) sdata);
1731         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1732                     (unsigned long) sdata);
1733         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1734                     (unsigned long) sdata);
1735         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1736                     (unsigned long) sdata);
1737         skb_queue_head_init(&ifmgd->skb_queue);
1738
1739         ifmgd->flags = 0;
1740
1741         mutex_init(&ifmgd->mtx);
1742
1743         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1744                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1745         else
1746                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1747 }
1748
1749 /* scan finished notification */
1750 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1751 {
1752         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1753
1754         /* Restart STA timers */
1755         rcu_read_lock();
1756         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1757                 ieee80211_restart_sta_timer(sdata);
1758         rcu_read_unlock();
1759 }
1760
1761 int ieee80211_max_network_latency(struct notifier_block *nb,
1762                                   unsigned long data, void *dummy)
1763 {
1764         s32 latency_usec = (s32) data;
1765         struct ieee80211_local *local =
1766                 container_of(nb, struct ieee80211_local,
1767                              network_latency_notifier);
1768
1769         mutex_lock(&local->iflist_mtx);
1770         ieee80211_recalc_ps(local, latency_usec);
1771         mutex_unlock(&local->iflist_mtx);
1772
1773         return 0;
1774 }
1775
1776 /* config hooks */
1777 static enum work_done_result
1778 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1779                           struct sk_buff *skb)
1780 {
1781         if (!skb) {
1782                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1783                 return WORK_DONE_DESTROY;
1784         }
1785
1786         if (wk->type == IEEE80211_WORK_AUTH) {
1787                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1788                 return WORK_DONE_DESTROY;
1789         }
1790
1791         mutex_lock(&wk->sdata->u.mgd.mtx);
1792         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1793         mutex_unlock(&wk->sdata->u.mgd.mtx);
1794
1795         wk->type = IEEE80211_WORK_AUTH;
1796         wk->probe_auth.tries = 0;
1797         return WORK_DONE_REQUEUE;
1798 }
1799
1800 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1801                        struct cfg80211_auth_request *req)
1802 {
1803         const u8 *ssid;
1804         struct ieee80211_work *wk;
1805         u16 auth_alg;
1806
1807         switch (req->auth_type) {
1808         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1809                 auth_alg = WLAN_AUTH_OPEN;
1810                 break;
1811         case NL80211_AUTHTYPE_SHARED_KEY:
1812                 auth_alg = WLAN_AUTH_SHARED_KEY;
1813                 break;
1814         case NL80211_AUTHTYPE_FT:
1815                 auth_alg = WLAN_AUTH_FT;
1816                 break;
1817         case NL80211_AUTHTYPE_NETWORK_EAP:
1818                 auth_alg = WLAN_AUTH_LEAP;
1819                 break;
1820         default:
1821                 return -EOPNOTSUPP;
1822         }
1823
1824         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1825         if (!wk)
1826                 return -ENOMEM;
1827
1828         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1829
1830         if (req->ie && req->ie_len) {
1831                 memcpy(wk->ie, req->ie, req->ie_len);
1832                 wk->ie_len = req->ie_len;
1833         }
1834
1835         if (req->key && req->key_len) {
1836                 wk->probe_auth.key_len = req->key_len;
1837                 wk->probe_auth.key_idx = req->key_idx;
1838                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1839         }
1840
1841         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1842         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1843         wk->probe_auth.ssid_len = ssid[1];
1844
1845         wk->probe_auth.algorithm = auth_alg;
1846         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1847
1848         /* if we already have a probe, don't probe again */
1849         if (req->bss->proberesp_ies)
1850                 wk->type = IEEE80211_WORK_AUTH;
1851         else
1852                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
1853         wk->chan = req->bss->channel;
1854         wk->sdata = sdata;
1855         wk->done = ieee80211_probe_auth_done;
1856
1857         ieee80211_add_work(wk);
1858         return 0;
1859 }
1860
1861 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1862                                                   struct sk_buff *skb)
1863 {
1864         struct ieee80211_mgmt *mgmt;
1865         u16 status;
1866
1867         if (!skb) {
1868                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1869                 return WORK_DONE_DESTROY;
1870         }
1871
1872         mgmt = (void *)skb->data;
1873         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1874
1875         if (status == WLAN_STATUS_SUCCESS) {
1876                 mutex_lock(&wk->sdata->u.mgd.mtx);
1877                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1878                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1879                         /* oops -- internal error -- send timeout for now */
1880                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1881                                                     wk->filter_ta);
1882                         return WORK_DONE_DESTROY;
1883                 }
1884                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1885         }
1886
1887         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1888         return WORK_DONE_DESTROY;
1889 }
1890
1891 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1892                         struct cfg80211_assoc_request *req)
1893 {
1894         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1895         struct ieee80211_bss *bss = (void *)req->bss->priv;
1896         struct ieee80211_work *wk;
1897         const u8 *ssid;
1898         int i;
1899
1900         mutex_lock(&ifmgd->mtx);
1901         if (ifmgd->associated) {
1902                 if (!req->prev_bssid ||
1903                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
1904                            ETH_ALEN)) {
1905                         /*
1906                          * We are already associated and the request was not a
1907                          * reassociation request from the current BSS, so
1908                          * reject it.
1909                          */
1910                         mutex_unlock(&ifmgd->mtx);
1911                         return -EALREADY;
1912                 }
1913
1914                 /* Trying to reassociate - clear previous association state */
1915                 ieee80211_set_disassoc(sdata);
1916         }
1917         mutex_unlock(&ifmgd->mtx);
1918
1919         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1920         if (!wk)
1921                 return -ENOMEM;
1922
1923         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1924         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
1925
1926         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1927                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1928                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1929                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1930                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1931
1932
1933         if (req->ie && req->ie_len) {
1934                 memcpy(wk->ie, req->ie, req->ie_len);
1935                 wk->ie_len = req->ie_len;
1936         } else
1937                 wk->ie_len = 0;
1938
1939         wk->assoc.bss = req->bss;
1940
1941         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1942
1943         /* new association always uses requested smps mode */
1944         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1945                 if (ifmgd->powersave)
1946                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1947                 else
1948                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1949         } else
1950                 ifmgd->ap_smps = ifmgd->req_smps;
1951
1952         wk->assoc.smps = ifmgd->ap_smps;
1953         /*
1954          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1955          * We still associate in non-HT mode (11a/b/g) if any one of these
1956          * ciphers is configured as pairwise.
1957          * We can set this to true for non-11n hardware, that'll be checked
1958          * separately along with the peer capabilities.
1959          */
1960         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1961         wk->assoc.capability = req->bss->capability;
1962         wk->assoc.wmm_used = bss->wmm_used;
1963         wk->assoc.supp_rates = bss->supp_rates;
1964         wk->assoc.supp_rates_len = bss->supp_rates_len;
1965         wk->assoc.ht_information_ie =
1966                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1967
1968         if (bss->wmm_used && bss->uapsd_supported &&
1969             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
1970                 wk->assoc.uapsd_used = true;
1971                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
1972         } else {
1973                 wk->assoc.uapsd_used = false;
1974                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
1975         }
1976
1977         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1978         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1979         wk->assoc.ssid_len = ssid[1];
1980
1981         if (req->prev_bssid)
1982                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1983
1984         wk->type = IEEE80211_WORK_ASSOC;
1985         wk->chan = req->bss->channel;
1986         wk->sdata = sdata;
1987         wk->done = ieee80211_assoc_done;
1988
1989         if (req->use_mfp) {
1990                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1991                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1992         } else {
1993                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1994                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1995         }
1996
1997         if (req->crypto.control_port)
1998                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1999         else
2000                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2001
2002         ieee80211_add_work(wk);
2003         return 0;
2004 }
2005
2006 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2007                          struct cfg80211_deauth_request *req,
2008                          void *cookie)
2009 {
2010         struct ieee80211_local *local = sdata->local;
2011         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2012         struct ieee80211_work *wk;
2013         const u8 *bssid = req->bss->bssid;
2014
2015         mutex_lock(&ifmgd->mtx);
2016
2017         if (ifmgd->associated == req->bss) {
2018                 bssid = req->bss->bssid;
2019                 ieee80211_set_disassoc(sdata);
2020                 mutex_unlock(&ifmgd->mtx);
2021         } else {
2022                 bool not_auth_yet = false;
2023
2024                 mutex_unlock(&ifmgd->mtx);
2025
2026                 mutex_lock(&local->work_mtx);
2027                 list_for_each_entry(wk, &local->work_list, list) {
2028                         if (wk->sdata != sdata)
2029                                 continue;
2030
2031                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2032                             wk->type != IEEE80211_WORK_AUTH)
2033                                 continue;
2034
2035                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2036                                 continue;
2037
2038                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2039                         list_del_rcu(&wk->list);
2040                         free_work(wk);
2041                         break;
2042                 }
2043                 mutex_unlock(&local->work_mtx);
2044
2045                 /*
2046                  * If somebody requests authentication and we haven't
2047                  * sent out an auth frame yet there's no need to send
2048                  * out a deauth frame either. If the state was PROBE,
2049                  * then this is the case. If it's AUTH we have sent a
2050                  * frame, and if it's IDLE we have completed the auth
2051                  * process already.
2052                  */
2053                 if (not_auth_yet) {
2054                         __cfg80211_auth_canceled(sdata->dev, bssid);
2055                         return 0;
2056                 }
2057         }
2058
2059         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2060                sdata->name, bssid, req->reason_code);
2061
2062         ieee80211_send_deauth_disassoc(sdata, bssid,
2063                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2064                         cookie);
2065
2066         ieee80211_recalc_idle(sdata->local);
2067
2068         return 0;
2069 }
2070
2071 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2072                            struct cfg80211_disassoc_request *req,
2073                            void *cookie)
2074 {
2075         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2076
2077         mutex_lock(&ifmgd->mtx);
2078
2079         /*
2080          * cfg80211 should catch this ... but it's racy since
2081          * we can receive a disassoc frame, process it, hand it
2082          * to cfg80211 while that's in a locked section already
2083          * trying to tell us that the user wants to disconnect.
2084          */
2085         if (ifmgd->associated != req->bss) {
2086                 mutex_unlock(&ifmgd->mtx);
2087                 return -ENOLINK;
2088         }
2089
2090         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2091                sdata->name, req->bss->bssid, req->reason_code);
2092
2093         ieee80211_set_disassoc(sdata);
2094
2095         mutex_unlock(&ifmgd->mtx);
2096
2097         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2098                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2099                         cookie);
2100
2101         ieee80211_recalc_idle(sdata->local);
2102
2103         return 0;
2104 }
2105
2106 int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
2107                          struct ieee80211_channel *chan,
2108                          enum nl80211_channel_type channel_type,
2109                          const u8 *buf, size_t len, u64 *cookie)
2110 {
2111         struct ieee80211_local *local = sdata->local;
2112         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2113         struct sk_buff *skb;
2114
2115         /* Check that we are on the requested channel for transmission */
2116         if ((chan != local->tmp_channel ||
2117              channel_type != local->tmp_channel_type) &&
2118             (chan != local->oper_channel ||
2119              channel_type != local->oper_channel_type))
2120                 return -EBUSY;
2121
2122         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
2123         if (!skb)
2124                 return -ENOMEM;
2125         skb_reserve(skb, local->hw.extra_tx_headroom);
2126
2127         memcpy(skb_put(skb, len), buf, len);
2128
2129         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
2130                 IEEE80211_SKB_CB(skb)->flags |=
2131                         IEEE80211_TX_INTFL_DONT_ENCRYPT;
2132         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX |
2133                 IEEE80211_TX_CTL_REQ_TX_STATUS;
2134         skb->dev = sdata->dev;
2135         ieee80211_tx_skb(sdata, skb);
2136
2137         *cookie = (unsigned long) skb;
2138         return 0;
2139 }